int FindCurrentSectionPosition(int fromPosition)
{
IListAdapter adapter = Adapter;
if (fromPosition >= adapter.Count)
{
return(-1); // dataset has changed, no candidate
}
if (adapter.GetType().IsAssignableFrom(typeof(ISectionIndexer)))
{
// try fast way by asking section indexer
ISectionIndexer indexer = (ISectionIndexer)adapter;
int sectionPosition = indexer.GetSectionForPosition(fromPosition);
int itemPosition = indexer.GetPositionForSection(sectionPosition);
int typeView = adapter.GetItemViewType(itemPosition);
if (IsItemViewTypePinned(adapter, typeView))
{
return(itemPosition);
} // else, no luck
}
// try slow way by looking through to the next section item above
for (int position = fromPosition; position >= 0; position--)
{
int viewType = adapter.GetItemViewType(position);
if (IsItemViewTypePinned(adapter, viewType))
{
return(position);
}
}
return(-1); // no candidate found
}
int findCurrentSectionPosition(int fromPosition)
{
IListAdapter adapter = Adapter;
// if (adapter.GetType() == ISectionIndexer) {
// // try fast way by asking section indexer
// SectionIndexerImpl indexer = (SectionIndexerImpl) adapter;
// int sectionPosition = indexer.GetSectionForPosition(fromPosition);
// int itemPosition = indexer.GetPositionForSection(sectionPosition);
// int typeView = adapter.GetItemViewType(itemPosition);
// if (isItemViewTypePinned(adapter, typeView)) {
// return itemPosition;
// } // else, no luck
// }
// try slow way by looking through to the next section item above
for (int position = fromPosition; position >= 0; position--)
{
int viewType = adapter.GetItemViewType(position);
if (isItemViewTypePinned(adapter, viewType))
{
return(position);
}
}
return(-1); // no candidate found
}
public int GetItemViewType(int position)
{
int numHeadersAndPlaceholders = HeadersCount * mNumColumns;
if (position < numHeadersAndPlaceholders && (position % mNumColumns != 0))
{
// Placeholders get the last view type number
return mAdapter != null ? mAdapter.ViewTypeCount : 1;
}
if (mAdapter != null && position >= numHeadersAndPlaceholders && position < numHeadersAndPlaceholders + mAdapter.Count)
{
int adjPosition = position - numHeadersAndPlaceholders;
int adapterCount = mAdapter.Count;
if (adjPosition < adapterCount)
{
return mAdapter.GetItemViewType(adjPosition);
}
}
int numFootersAndPlaceholders = FootersCount * mNumColumns;
if (mAdapter != null && position < numHeadersAndPlaceholders + mAdapter.Count + numFootersAndPlaceholders)
{
return mAdapter != null ? mAdapter.ViewTypeCount : 1;
}
return AdapterView.ItemViewTypeHeaderOrFooter;
}
int FindFirstVisibleSectionPosition(int firstVisibleItem, int visibleItemCount)
{
IListAdapter adapter = Adapter;
int adapterDataCount = adapter.Count;
if (LastVisiblePosition >= adapterDataCount)
{
return(-1); // dataset has changed, no candidate
}
if (firstVisibleItem + visibleItemCount >= adapterDataCount)
{//added to prevent index Outofbound (in case)
visibleItemCount = adapterDataCount - firstVisibleItem;
}
for (int childIndex = 0; childIndex < visibleItemCount; childIndex++)
{
int position = firstVisibleItem + childIndex;
int viewType = adapter.GetItemViewType(position);
if (IsItemViewTypePinned(adapter, viewType))
{
return(position);
}
}
return(-1);
}
public int GetItemViewType(int position)
{
int numHeadersAndPlaceholders = GetHeadersCount() * _numColumns;
int adapterViewTypeStart = _adapter == null ? 0 : _adapter.ViewTypeCount - 1;
int type = ItemViewTypeHeaderOrFooter;
if (_cachePlaceHoldView)
{
// Header
if (position < numHeadersAndPlaceholders)
{
if (position == 0)
{
if (_cacheFirstHeaderView)
{
type = adapterViewTypeStart + _headerViewInfos.Count + _footerViewInfos.Count + 1 + 1;
}
}
if (position % _numColumns != 0)
{
type = adapterViewTypeStart + (position / _numColumns + 1);
}
}
}
// Adapter
int adjPosition = position - numHeadersAndPlaceholders;
int adapterCount = 0;
if (_adapter != null)
{
adapterCount = GetAdapterAndPlaceHolderCount();
if (adjPosition >= 0 && adjPosition < adapterCount)
{
if (adjPosition < _adapter.Count)
{
type = _adapter.GetItemViewType(adjPosition);
}
else
{
if (_cachePlaceHoldView)
{
type = adapterViewTypeStart + _headerViewInfos.Count + 1;
}
}
}
}
if (_cachePlaceHoldView)
{
// Footer
int footerPosition = adjPosition - adapterCount;
if (footerPosition >= 0 && footerPosition < Count && (footerPosition % _numColumns) != 0)
{
type = adapterViewTypeStart + _headerViewInfos.Count + 1 + (footerPosition / _numColumns + 1);
}
}
return(type);
}
public int GetItemViewType(int position)
{
int numHeaders = HeadersCount;
if (mAdapter != null && position >= numHeaders)
{
int adjPosition = position - numHeaders;
int adapterCount = mAdapter.Count;
if (adjPosition < adapterCount)
{
return(mAdapter.GetItemViewType(adjPosition));
}
}
return(AdapterView.ItemViewTypeHeaderOrFooter);
}
int IAdapter.GetItemViewType (int position)
{
int numHeadersAndPlaceholders = getHeadersCount() * _numColumns;
int adapterViewTypeStart = mAdapter == null ? 0 : mAdapter.ViewTypeCount - 1;
int type = AdapterView.ItemViewTypeHeaderOrFooter;
if (cachePlaceHoldView) {
// Header
if (position < numHeadersAndPlaceholders) {
if (position == 0) {
if (mCacheFirstHeaderView) {
type = adapterViewTypeStart + _headerViewInfos.Count + _footerViewInfos.Count + 1 + 1;
}
}
if (position % _numColumns != 0) {
type = adapterViewTypeStart + (position / _numColumns + 1);
}
}
}
// Adapter
int adjPosition = position - numHeadersAndPlaceholders;
int adapterCount = 0;
if (mAdapter != null) {
adapterCount = getAdapterAndPlaceHolderCount();
if (adjPosition >= 0 && adjPosition < adapterCount) {
if (adjPosition < mAdapter.Count) {
type = mAdapter.GetItemViewType(adjPosition);
} else {
if (cachePlaceHoldView) {
type = adapterViewTypeStart + _headerViewInfos.Count + 1;
}
}
}
}
if (cachePlaceHoldView) {
// Footer
int footerPosition = adjPosition - adapterCount;
if (footerPosition >= 0 && footerPosition < obj.Count && (footerPosition % _numColumns) != 0) {
type = adapterViewTypeStart + _headerViewInfos.Count() + 1 + (footerPosition / _numColumns + 1);
}
}
if (_debug) {
Log.Debug(_logTag, String.Format("getItemViewType: pos: %s, result: %s", position, type, cachePlaceHoldView, mCacheFirstHeaderView));
}
return type;
}
public void OnScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount)
{
Console.WriteLine("on scrolll event");
if (psl.mDelegateOnScrollListener != null) // delegate
{
psl.mDelegateOnScrollListener.OnScroll(view, firstVisibleItem, visibleItemCount, totalItemCount);
}
// get expected adapter or fail fast
IListAdapter adapter = psl.Adapter;
if (adapter == null || visibleItemCount == 0)
{
return; // nothing to do
}
Boolean isFirstVisibleItemSection =
isItemViewTypePinned(adapter, adapter.GetItemViewType(firstVisibleItem));
if (isFirstVisibleItemSection)
{
View sectionView = psl.GetChildAt(0);
if (sectionView.Top == psl.PaddingTop) // view sticks to the top, no need for pinned shadow
{
psl.destroyPinnedShadow();
}
else // section doesn't stick to the top, make sure we have a pinned shadow
{
psl.ensureShadowForPosition(firstVisibleItem, firstVisibleItem, visibleItemCount);
}
}
else // section is not at the first visible position
{
int sectionPosition = psl.findCurrentSectionPosition(firstVisibleItem);
if (sectionPosition > -1) // we have section position
{
psl.ensureShadowForPosition(sectionPosition, firstVisibleItem, visibleItemCount);
}
else // there is no section for the first visible item, destroy shadow
{
psl.destroyPinnedShadow();
}
}
}
public int GetItemViewType(int position)
{
int numHeadersAndPlaceholders = HeadersCount * mNumColumns;
if (position < numHeadersAndPlaceholders && (position % mNumColumns != 0))
{
return(mAdapter != null ? mAdapter.ViewTypeCount : 1);
}
if (mAdapter != null && position >= numHeadersAndPlaceholders)
{
int adjPosition = position - numHeadersAndPlaceholders;
int adapterCount = mAdapter.Count;
if (adjPosition < adapterCount)
{
return(mAdapter.GetItemViewType(adjPosition));
}
}
return(AdapterView.ItemViewTypeHeaderOrFooter);
}
public void OnScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount)
{
if (mDelegateOnScrollListener != null)
{ // delegate
mDelegateOnScrollListener.OnScroll(view, firstVisibleItem, visibleItemCount, totalItemCount);
}
//
IListAdapter adapter = Adapter;
if (adapter == null || visibleItemCount == 0)
{
return; // nothing to do
}
bool isFirstVisibleItemSection = IsItemViewTypePinned(adapter, adapter.GetItemViewType(firstVisibleItem));
if (isFirstVisibleItemSection)
{
View sectionView = GetChildAt(0);
if (sectionView.Top == PaddingTop)
{ // view sticks to the top, no need for pinned shadow
DestroyPinnedShadow();
}
else
{ // section doesn't stick to the top, make sure we have a pinned shadow
EnsureShadowForPosition(firstVisibleItem, firstVisibleItem, visibleItemCount);
}
}
else
{ // section is not at the first visible position
int sectionPosition = FindCurrentSectionPosition(firstVisibleItem);
if (sectionPosition > -1)
{ // we have section position
EnsureShadowForPosition(sectionPosition, firstVisibleItem, visibleItemCount);
}
else
{ // there is no section for the first visible item, destroy shadow
DestroyPinnedShadow();
}
}
}
public override int GetItemViewType(int position)
{
return(mAdapter.GetItemViewType(position));
}
public override int GetItemViewType(int position)
{
int itemViewType = _wrappedAdapter.GetItemViewType(position);
return(itemViewType);
}
